Dynamic Resource Allocation of Random Access for MTC Devices

ETRI Journal

关键词: Dynamic resource allocation;    Dynamic frame slotted ALOHA;    RACH procedure;    Throughput;    LTE‐A;   

DOI  :  10.4218/etrij.17.0116.0825

来源: DOAJ

【 摘 要 】

In a long term evolution‐advanced (LTE‐A) system, the traffic overload of machine type communication devices is a challenge because too many devices attempt to access a base station (BS) simultaneously in a short period of time. We discuss the challenge of the gap between the theoretical maximum throughput and the actual throughput. A gap occurs when the BS cannot change the number of preambles for a random access channel (RACH) until multiple numbers of RACHs are completed. In addition, a preamble partition approach is proposed in this paper that uses two groups of preambles to reduce this gap. A performance evaluation shows that the proposed approach increases the average throughput. For 100,000 devices in a cell, the throughput is increased by 29.7% to 114.4% and 23.0% to 91.3% with uniform and Beta‐distributed arrivals of devices, respectively.

【 授权许可】

Unknown